Patent US2579020A successfully refreshed from Google Patents.
US2579020A
Expired / Lapsed
US
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Color shifting agents and method of using same
Assignee: Individual
•
Filing: 1948-02-27
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Granted: 1951-12-18
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Expires: 1968-02-27
Abstract
No abstract record available.
Inventors
- 👤 Smith Frederick Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:30
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/04; C09C1/043; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/80; C01P2002/82; C01P2002/84; C01P2004/00; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
A PIGMENT COMPRISING IN COMBINATION: ZINC OXIDE, A COLOURING METAL OXIDE DISPOSED IN SOLID SOLUTION WITHIN THE CRYSTAL STRUCTURE OF THE ZINC OXIDE, AND A COLOURLESS COLOUR SHIFTING AGENT SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM OXIDE AND CADMIUM OXIDE PRESENT IN AN AMOUNT OF BETWEEN 2% AND ABOUT 30% BY WEIGHT OF THE ZINC OXIDE AND COLOURING METAL IN SOLID SOLUTION IN SAID PIGMENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |